Warning (2): Trying to access array offset on value of type null [APP/Controller/MeniconController.php, line 268]

    {
        $config_keyword     = Configure::read('KEYWORDS_MENICON');
        $keyword     = (isset($config_keyword[$this->action])) ? $config_keyword[$this->action] : $config_keyword['default'];

MeniconController::_setKeyword() - APP/Controller/MeniconController.php, line 268
MeniconController::beforeFilter() - APP/Controller/MeniconController.php, line 231
CakeEventManager::dispatch() - CORE/Cake/Event/CakeEventManager.php, line 244
Controller::startupProcess() - CORE/Cake/Controller/Controller.php, line 687
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 189
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
[main] - APP/webroot/index.php, line 108